EFFECT OF EXCESS ENTHALPY RELAXATION ON PERMEATION OF CO2 AND TOLUENE THROUGH PET FILM

作     者：柯毓才,Bischoff Manfred 

作者机构：Institute of Chemistry Academia Sinica Beijing Institute of Plastic Testing University Stuttgart West Germany 

出 版 物：《Chinese Journal of Polymer Science》 (高分子科学(英文版))

年 卷 期：1985年第3卷第1期

页      面：56-62页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 0817[工学-化学工程与技术] 08[工学] 070305[理学-高分子化学与物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

主　　题：heat OC EFFECT OF EXCESS ENTHALPY RELAXATION ON PERMEATION OF CO2 AND TOLUENE THROUGH PET FILM PET Figure CO 

摘      要：Structural change in an unoriented, amorphous PET film annealed at temperatures below Tgand the effect of excess enthalpy relaxation on permeation rates of CO2gas and toluene liquid intreated samples have been studied. The results suggest that the amount of excess enthalpy relaxa-tion as determined from the endothermic peak in Tginterval, the Tgand density all increase withannealing time, but the trans-conformation component of samples decreases. No change of struc-ture in the amorphous phase was found other than the normal densification of the molecular chainpacking or a reduction in free volume had occurred during the annealing regimes. Therefore, thepermeation rate of CO2gas in treated samples reduced. While the apparent permeation rate oftoluene liquid increased with annealing time because of a creation of extensive cracks at film surfacearising from both the increase in embrittlement of polymer and the swelling action of toluene liquidon treated samples.